FiveTech Software tech support forums

by **Antonio Linares** » Wed Aug 24, 2016 11:10 pm

Tim,

Please copy my PRG to FWH\samples\dshow.prg and do buildh32.bat dshow

Thats how I am testing it here

by **Antonio Linares** » Wed Aug 24, 2016 11:15 pm

by **TimStone** » Wed Aug 24, 2016 11:19 pm

Are these still Borland builds ? I still cannot get it to compile with MSVC 2015

Tim

by **Antonio Linares** » Wed Aug 24, 2016 11:20 pm

I am using MSVC 2015 Community Edition

do samples\buildh32.bat dshow

by **Antonio Linares** » Wed Aug 24, 2016 11:23 pm

going to bed :-)

by **TimStone** » Wed Aug 24, 2016 11:30 pm

I'm getting an error at line 5, and the a has an ' over it.

by **TimStone** » Thu Aug 25, 2016 2:42 am

I cleaned up the space around that line, and now get the following build error following your instructions:

Code: Select all Expand view RUN: Lines 4861, Functions/Procedures 1 Generating C source output to 'dshow.c'... Done. dshow.c dshow.prg(22): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(22): error C2065: 'ÿ': undeclared identifier dshow.prg(22): error C2146: syntax error: missing ';' before identifier 'ÿHRESULT' dshow.prg(22): error C2065: 'ÿHRESULT': undeclared identifier dshow.prg(22): error C2146: syntax error: missing ';' before identifier 'hr' dshow.prg(22): error C2065: 'hr': undeclared identifier dshow.prg(23): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(23): error C2065: 'ÿ': undeclared identifier dshow.prg(23): error C2146: syntax error: missing ';' before identifier 'ÿICreateDevEnum' dshow.prg(23): error C2065: 'ÿICreateDevEnum': undeclared identifier dshow.prg(23): error C2065: 'pDevEnum': undeclared identifier dshow.prg(24): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(24): error C2065: 'ÿ': undeclared identifier dshow.prg(24): error C2146: syntax error: missing ';' before identifier 'ÿIEnumMoniker' dshow.prg(24): error C2065: 'ÿIEnumMoniker': undeclared identifier dshow.prg(24): error C2065: 'pEnum': undeclared identifier dshow.prg(25): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(25): error C2065: 'ÿ': undeclared identifier dshow.prg(25): error C2146: syntax error: missing ';' before identifier 'ÿIMoniker' dshow.prg(25): error C2065: 'ÿIMoniker': undeclared identifier dshow.prg(25): error C2065: 'pMoniker': undeclared identifier dshow.prg(26): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(26): error C2065: 'ÿ': undeclared identifier dshow.prg(26): error C2146: syntax error: missing ';' before identifier 'ÿIPropertyBag' dshow.prg(26): error C2065: 'ÿIPropertyBag': undeclared identifier dshow.prg(26): error C2065: 'pPropBag': undeclared identifier dshow.prg(27): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(27): error C2065: 'ÿ': undeclared identifier dshow.prg(27): error C2146: syntax error: missing ';' before identifier 'ÿIGraphBuilder' dshow.prg(27): error C2065: 'ÿIGraphBuilder': undeclared identifier dshow.prg(27): error C2065: 'pGraph': undeclared identifier dshow.prg(28): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(28): error C2065: 'ÿ': undeclared identifier dshow.prg(28): error C2146: syntax error: missing ';' before identifier 'ÿICaptureGraphBuilder2' dshow.prg(28): error C2065: 'ÿICaptureGraphBuilder2': undeclared identifier dshow.prg(28): error C2065: 'pBuilder': undeclared identifier dshow.prg(29): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(29): error C2065: 'ÿ': undeclared identifier dshow.prg(29): error C2146: syntax error: missing ';' before identifier 'ÿIBaseFilter' dshow.prg(29): error C2065: 'ÿIBaseFilter': undeclared identifier dshow.prg(29): error C2065: 'pCap': undeclared identifier dshow.prg(30): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(30): error C2065: 'ÿ': undeclared identifier dshow.prg(30): error C2146: syntax error: missing ';' before identifier 'ÿIBaseFilter' dshow.prg(30): error C2065: 'ÿIBaseFilter': undeclared identifier dshow.prg(30): error C2065: 'pSampleGrabberFilter': undeclared identifier dshow.prg(31): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(31): error C2065: 'ÿ': undeclared identifier dshow.prg(31): error C2146: syntax error: missing ';' before identifier 'ÿIBaseFilter' dshow.prg(31): error C2065: 'ÿIBaseFilter': undeclared identifier dshow.prg(31): error C2065: 'pNullRenderer': undeclared identifier dshow.prg(32): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(32): error C2065: 'ÿ': undeclared identifier dshow.prg(32): error C2146: syntax error: missing ';' before identifier 'ÿIMediaControl' dshow.prg(32): error C2065: 'ÿIMediaControl': undeclared identifier dshow.prg(32): error C2065: 'pMediaControl': undeclared identifier dshow.prg(33): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(33): error C2065: 'ÿ': undeclared identifier dshow.prg(33): error C2146: syntax error: missing ';' before identifier 'ÿchar' dshow.prg(33): error C2065: 'ÿchar': undeclared identifier dshow.prg(33): error C2065: 'pBuffer': undeclared identifier dshow.prg(34): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(34): error C2065: 'ÿ': undeclared identifier dshow.prg(34): error C2146: syntax error: missing ';' before identifier 'ÿVARIANT' dshow.prg(34): error C2065: 'ÿVARIANT': undeclared identifier dshow.prg(34): error C2146: syntax error: missing ';' before identifier 'var' dshow.prg(34): error C2065: 'var': undeclared identifier dshow.prg(35): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(35): error C2065: 'ÿ': undeclared identifier dshow.prg(35): error C2146: syntax error: missing ';' before identifier 'ÿ' dshow.prg(35): error C2144: syntax error: 'int' should be preceded by ';' dshow.prg(36): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(36): error C2065: 'ÿ': undeclared identifier dshow.prg(36): error C2146: syntax error: missing ';' before identifier 'ÿ' dshow.prg(36): error C2144: syntax error: 'int' should be preceded by ';' dshow.prg(37): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(37): error C2065: 'ÿ': undeclared identifier dshow.prg(37): error C2146: syntax error: missing ';' before identifier 'ÿ' dshow.prg(37): error C2144: syntax error: 'char' should be preceded by ';' dshow.prg(38): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(38): error C2065: 'ÿ': undeclared identifier dshow.prg(38): error C2146: syntax error: missing ';' before identifier 'ÿchar' dshow.prg(38): error C2065: 'ÿchar': undeclared identifier dshow.prg(38): error C2146: syntax error: missing ';' before identifier 'char_buffer' dshow.prg(38): error C2065: 'char_buffer': undeclared identifier dshow.prg(39): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(39): error C2653: 'ÿDexterLib': is not a class or namespace name dshow.prg(39): error C2065: 'ÿ': undeclared identifier dshow.prg(39): error C2146: syntax error: missing ';' before identifier 'ISampleGrabber' dshow.prg(39): error C2065: 'ISampleGrabber': undeclared identifier dshow.prg(39): error C2065: 'pSampleGrabber': undeclared identifier dshow.prg(41): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(41): error C2065: 'ÿ': undeclared identifier dshow.prg(41): error C2146: syntax error: missing ';' before identifier 'ÿstrcpy' dshow.prg(41): error C3861: 'ÿstrcpy': identifier not found dshow.prg(43): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(43): error C2065: 'ÿ': undeclared identifier dshow.prg(43): error C2146: syntax error: missing ';' before identifier 'ÿhr' dshow.prg(43): error C2065: 'ÿhr': undeclared identifier dshow.prg(45): error C3873: '0xa0': this character is not allowed as a first character of an identifier dshow.prg(45): error C2065: 'ÿ': undeclared identifier dshow.prg(45): fatal error C1003: error count exceeds 100; stopping compilation LINK : fatal error LNK1181: cannot open input file 'dshow.obj' * Linking errors *

I must be missing something in my available files.

Tim

by **Antonio Linares** » Thu Aug 25, 2016 3:07 pm

Tim,

Please use this dshow.prg:

https://bitbucket.org/fivetech/fivewin-contributions/downloads/dshow.prg

by **rhlawek** » Thu Aug 25, 2016 5:01 pm

Antonio,

I am able to get this to compile and run using VS 2015, but I needed to do/change a couple things:

1) Explicitly set to compile as CPP code instead of C.
2) Changed MessageBox() calls to MessageBoxA() to get around a unicode/casting error.

by **Antonio Linares** » Thu Aug 25, 2016 5:05 pm

Robb,

Yes, it has to be compiled in C++ mode

FWH\samples\buildh32.bat does it automatically

by **Antonio Linares** » Thu Aug 25, 2016 5:07 pm

> 2) Changed MessageBox() calls to MessageBoxA() to get around a unicode/casting error

that may be as you are using unicode at compiling time.

buildh32.bat works fine and does not use unicode

by **rhlawek** » Thu Aug 25, 2016 5:14 pm

One other thing I forgot is I had to add "strmiids" to my list of libs to resolve a bunch of unresolved externals. I don't see that lib referenced in buildh32.bat so I'm not sure why I see the missing externals and you don't.

I am able to get it to run both as 32 and 64 bit.

by **Antonio Linares** » Thu Aug 25, 2016 5:27 pm

Robb,

I mentioned here that strmiids.lib has to be linked:

viewtopic.php?p=193422#p193422

many thanks for your feedback

by **Antonio Linares** » Thu Aug 25, 2016 5:28 pm

This version turns the ActiveMovie Window as a child window of our app:

dshow.prg

Code: Select all Expand view RUN: #include "FiveWin.ch" function Main() local oWnd, hWnd DEFINE WINDOW oWnd ACTIVATE WINDOW oWnd MAXIMIZED ; ON INIT ( DShowCamera(),; SetParent( hWnd := FindWindow( 0, "ActiveMovie Window" ), oWnd:hWnd ),; SetWindowPos( hWnd, 0, 10, 10, 300, 300 ) ) return nil #pragma BEGINDUMP #include <dshow.h> #include <uuids.h> #include <objbase.h> #import "qedit.dll" raw_interfaces_only named_guids EXTERN_C const CLSID CLSID_NullRenderer; EXTERN_C const CLSID CLSID_SampleGrabber; HB_FUNC( DSHOWCAMERA ) { HRESULT hr; ICreateDevEnum *pDevEnum = NULL; IEnumMoniker *pEnum = NULL; IMoniker *pMoniker = NULL; IPropertyBag *pPropBag = NULL; IGraphBuilder *pGraph = NULL; ICaptureGraphBuilder2 *pBuilder = NULL; IBaseFilter *pCap = NULL; IBaseFilter *pSampleGrabberFilter = NULL; IBaseFilter *pNullRenderer = NULL; IMediaControl *pMediaControl = NULL; char *pBuffer = NULL; VARIANT var; int n = 0; int device_number = 0; char device_name[ 100 ]; char char_buffer[100]; DexterLib::ISampleGrabber *pSampleGrabber = NULL; strcpy( device_name, "" ); hr = CoInitializeEx( NULL, COINIT_MULTITHREADED ); if( hr != S_OK ) MessageBox( 0, "CoInitializeEx error", "ok", 0 ); hr = CoCreateInstance( CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, ( void ** ) &pGraph ); if( hr != S_OK ) MessageBox( 0, "CoCreateInstance error", "ok", 0 ); hr = CoCreateInstance( CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, ( void ** ) &pBuilder ); if( hr != S_OK ) MessageBox( 0, "CoCreateInstance 2 error", "ok", 0 ); hr = ( ( ICaptureGraphBuilder * ) pBuilder )->SetFiltergraph( pGraph ); if( hr != S_OK ) MessageBox( 0, "Could not attach capture graph builder to graph", "ok", 0 ); hr = CoCreateInstance( CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pDevEnum ) ); if( hr != S_OK ) MessageBox( 0, "Could not crerate system device enumerator", "ok", 0 ); hr = pDevEnum->CreateClassEnumerator( CLSID_VideoInputDeviceCategory, &pEnum, 0 ); if( hr != S_OK ) MessageBox( 0, "No video devices found", "ok", 0 ); while(1) { // Access next device hr = pEnum->Next(1, &pMoniker, NULL); if( hr == S_OK ) n++; // increment device count else break; // If device was specified by name rather than number... if( device_number == 0 ) { // Get video input device name hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag)); if (hr == S_OK) { // Get current device name VariantInit(&var); hr = pPropBag->Read(L"FriendlyName", &var, 0); // Convert to a normal C string, i.e. char* sprintf(char_buffer, "%ls", var.bstrVal); VariantClear(&var); pPropBag->Release(); pPropBag = NULL; // Exit loop if current device name matched devname // MessageBox( 0, char_buffer, "device_name", 0 ); if (strcmp(device_name, char_buffer) == 0) break; } else { MessageBox( 0, "Error getting device names", "ok", 0 ); break; } } else if (n >= device_number) break; } // Get video input device name hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag)); VariantInit(&var); hr = pPropBag->Read(L"FriendlyName", &var, 0); // MessageBoxW( 0, L"Capture device", var.bstrVal, 0 ); VariantClear(&var); // Create capture filter and add to graph hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap); if( hr != S_OK ) MessageBox( 0, "Could not create capture filter", "ok", 0 ); // Add capture filter to graph hr = pGraph->AddFilter(pCap, L"Capture Filter"); if( hr != S_OK ) MessageBox( 0, "Could not add capture filter to graph", "ok", 0 ); // Create sample grabber filter hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pSampleGrabberFilter); if( hr != S_OK ) MessageBox( 0, "Could not create Sample Grabber filter", "ok", 0 ); // Query the ISampleGrabber interface of the sample grabber filter hr = pSampleGrabberFilter->QueryInterface( DexterLib::IID_ISampleGrabber, (void**)&pSampleGrabber); if( hr != S_OK ) MessageBox( 0, "Could not get ISampleGrabber interface to sample grabber filter", "ok", 0 ); // Enable sample buffering in the sample grabber filter hr = pSampleGrabber->SetBufferSamples(TRUE); if( hr != S_OK ) MessageBox( 0, "Could not enable sample buffering in the sample grabber", "ok", 0 ); // Set media type in sample grabber filter AM_MEDIA_TYPE mt; ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE)); mt.majortype = MEDIATYPE_Video; mt.subtype = MEDIASUBTYPE_RGB24; hr = pSampleGrabber->SetMediaType((DexterLib::_AMMediaType *)&mt); if( hr != S_OK ) MessageBox( 0, "Could not set media type in sample grabber", "ok", 0 ); // Add sample grabber filter to filter graph hr = pGraph->AddFilter(pSampleGrabberFilter, L"SampleGrab"); if( hr != S_OK ) MessageBox( 0, "Could not add Sample Grabber to filter graph", "ok", 0 ); // Create Null Renderer filter hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pNullRenderer); if( hr != S_OK ) MessageBox( 0, "Could not create Null Renderer filter", "ok", 0 ); // Add Null Renderer filter to filter graph hr = pGraph->AddFilter(pNullRenderer, L"NullRender"); if( hr != S_OK ) MessageBox( 0, "Could not add Null Renderer to filter graph", "ok", 0 ); // Connect up the filter graph's capture stream hr = pBuilder->RenderStream( &PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pCap, pSampleGrabberFilter, pNullRenderer); if( hr != S_OK ) MessageBox( 0, "Could not render capture video stream", "ok", 0 ); hr = pBuilder->RenderStream( &PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL); if (hr != S_OK && hr != VFW_S_NOPREVIEWPIN) MessageBox( 0, "Could not render preview video stream", "ok", 0 ); // Get media control interfaces to graph builder object hr = pGraph->QueryInterface(IID_IMediaControl, (void**)&pMediaControl); if( hr != S_OK ) MessageBox( 0, "Could not get media control interface", "ok", 0 ); // Run graph while(1) { hr = pMediaControl->Run(); // Hopefully, the return value was S_OK or S_FALSE if (hr == S_OK) break; // graph is now running if (hr == S_FALSE) continue; // graph still preparing to run // If the Run function returned something else, // there must be a problem // fprintf(stderr, "Error: %u\n", hr); MessageBox( 0, "Could not run filter graph", "ok", 0 ); } } #pragma ENDDUMP

by **Antonio Linares** » Thu Aug 25, 2016 5:36 pm

Now we turn it into a control :-)

Code: Select all Expand view RUN: #include "FiveWin.ch" #define GWL_STYLE -16 function Main() local oWnd, hWnd DEFINE WINDOW oWnd ACTIVATE WINDOW oWnd MAXIMIZED ; ON INIT ( DShowCamera(),; SetParent( hWnd := FindWindow( 0, "ActiveMovie Window" ), oWnd:hWnd ),; SetWindowLong( hWnd, GWL_STYLE, nOr( WS_CHILD, WS_VISIBLE ) ),; SetWindowPos( hWnd, 0, 10, 10, 300, 300 ) ) return nil #pragma BEGINDUMP #include <dshow.h> #include <uuids.h> #include <objbase.h> #import "qedit.dll" raw_interfaces_only named_guids EXTERN_C const CLSID CLSID_NullRenderer; EXTERN_C const CLSID CLSID_SampleGrabber; HB_FUNC( DSHOWCAMERA ) { HRESULT hr; ICreateDevEnum *pDevEnum = NULL; IEnumMoniker *pEnum = NULL; IMoniker *pMoniker = NULL; IPropertyBag *pPropBag = NULL; IGraphBuilder *pGraph = NULL; ICaptureGraphBuilder2 *pBuilder = NULL; IBaseFilter *pCap = NULL; IBaseFilter *pSampleGrabberFilter = NULL; IBaseFilter *pNullRenderer = NULL; IMediaControl *pMediaControl = NULL; char *pBuffer = NULL; VARIANT var; int n = 0; int device_number = 0; char device_name[ 100 ]; char char_buffer[100]; DexterLib::ISampleGrabber *pSampleGrabber = NULL; strcpy( device_name, "" ); hr = CoInitializeEx( NULL, COINIT_MULTITHREADED ); if( hr != S_OK ) MessageBox( 0, "CoInitializeEx error", "ok", 0 ); hr = CoCreateInstance( CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, ( void ** ) &pGraph ); if( hr != S_OK ) MessageBox( 0, "CoCreateInstance error", "ok", 0 ); hr = CoCreateInstance( CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, ( void ** ) &pBuilder ); if( hr != S_OK ) MessageBox( 0, "CoCreateInstance 2 error", "ok", 0 ); hr = ( ( ICaptureGraphBuilder * ) pBuilder )->SetFiltergraph( pGraph ); if( hr != S_OK ) MessageBox( 0, "Could not attach capture graph builder to graph", "ok", 0 ); hr = CoCreateInstance( CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS( &pDevEnum ) ); if( hr != S_OK ) MessageBox( 0, "Could not crerate system device enumerator", "ok", 0 ); hr = pDevEnum->CreateClassEnumerator( CLSID_VideoInputDeviceCategory, &pEnum, 0 ); if( hr != S_OK ) MessageBox( 0, "No video devices found", "ok", 0 ); while(1) { // Access next device hr = pEnum->Next(1, &pMoniker, NULL); if( hr == S_OK ) n++; // increment device count else break; // If device was specified by name rather than number... if( device_number == 0 ) { // Get video input device name hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag)); if (hr == S_OK) { // Get current device name VariantInit(&var); hr = pPropBag->Read(L"FriendlyName", &var, 0); // Convert to a normal C string, i.e. char* sprintf(char_buffer, "%ls", var.bstrVal); VariantClear(&var); pPropBag->Release(); pPropBag = NULL; // Exit loop if current device name matched devname // MessageBox( 0, char_buffer, "device_name", 0 ); if (strcmp(device_name, char_buffer) == 0) break; } else { MessageBox( 0, "Error getting device names", "ok", 0 ); break; } } else if (n >= device_number) break; } // Get video input device name hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag)); VariantInit(&var); hr = pPropBag->Read(L"FriendlyName", &var, 0); // MessageBoxW( 0, L"Capture device", var.bstrVal, 0 ); VariantClear(&var); // Create capture filter and add to graph hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap); if( hr != S_OK ) MessageBox( 0, "Could not create capture filter", "ok", 0 ); // Add capture filter to graph hr = pGraph->AddFilter(pCap, L"Capture Filter"); if( hr != S_OK ) MessageBox( 0, "Could not add capture filter to graph", "ok", 0 ); // Create sample grabber filter hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pSampleGrabberFilter); if( hr != S_OK ) MessageBox( 0, "Could not create Sample Grabber filter", "ok", 0 ); // Query the ISampleGrabber interface of the sample grabber filter hr = pSampleGrabberFilter->QueryInterface( DexterLib::IID_ISampleGrabber, (void**)&pSampleGrabber); if( hr != S_OK ) MessageBox( 0, "Could not get ISampleGrabber interface to sample grabber filter", "ok", 0 ); // Enable sample buffering in the sample grabber filter hr = pSampleGrabber->SetBufferSamples(TRUE); if( hr != S_OK ) MessageBox( 0, "Could not enable sample buffering in the sample grabber", "ok", 0 ); // Set media type in sample grabber filter AM_MEDIA_TYPE mt; ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE)); mt.majortype = MEDIATYPE_Video; mt.subtype = MEDIASUBTYPE_RGB24; hr = pSampleGrabber->SetMediaType((DexterLib::_AMMediaType *)&mt); if( hr != S_OK ) MessageBox( 0, "Could not set media type in sample grabber", "ok", 0 ); // Add sample grabber filter to filter graph hr = pGraph->AddFilter(pSampleGrabberFilter, L"SampleGrab"); if( hr != S_OK ) MessageBox( 0, "Could not add Sample Grabber to filter graph", "ok", 0 ); // Create Null Renderer filter hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pNullRenderer); if( hr != S_OK ) MessageBox( 0, "Could not create Null Renderer filter", "ok", 0 ); // Add Null Renderer filter to filter graph hr = pGraph->AddFilter(pNullRenderer, L"NullRender"); if( hr != S_OK ) MessageBox( 0, "Could not add Null Renderer to filter graph", "ok", 0 ); // Connect up the filter graph's capture stream hr = pBuilder->RenderStream( &PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pCap, pSampleGrabberFilter, pNullRenderer); if( hr != S_OK ) MessageBox( 0, "Could not render capture video stream", "ok", 0 ); hr = pBuilder->RenderStream( &PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL); if (hr != S_OK && hr != VFW_S_NOPREVIEWPIN) MessageBox( 0, "Could not render preview video stream", "ok", 0 ); // Get media control interfaces to graph builder object hr = pGraph->QueryInterface(IID_IMediaControl, (void**)&pMediaControl); if( hr != S_OK ) MessageBox( 0, "Could not get media control interface", "ok", 0 ); // Run graph while(1) { hr = pMediaControl->Run(); // Hopefully, the return value was S_OK or S_FALSE if (hr == S_OK) break; // graph is now running if (hr == S_FALSE) continue; // graph still preparing to run // If the Run function returned something else, // there must be a problem // fprintf(stderr, "Error: %u\n", hr); MessageBox( 0, "Could not run filter graph", "ok", 0 ); } } #pragma ENDDUMP

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